GOLDEN — Carnies, connoisseurs of vintage goods and groupies of a bygone theme park crammed into kiddie-ride compartments Thursday morning, searching out a place to sit while they waited to bid on the remaining attractions, games and memorabilia of the Old West-themed Heritage Square Amusement Park. After more than 50 years of ups, downs, drops, squeals and delights, the park originally envisioned as a Disneyland of the West — created, even, with the help of erstwhile Disney theme-park visionaries — met a different fate than that coastal amusement icon. Heritage Square Amusement Park permanently closed in June, and Thursday brought the final nail in its fun-house coffin as attendees turned out to bid farewell — and for the park’s rides. Thursday’s auction capped off the slow demise of Heritage Square, brought about by the company’s settlement with landlord Martin Marietta Materials, which plans to redevelop the site off West Colfax Avenue near Interstate 70. The Heritage Square Music Hall once brought dinner-theater performances to audiences inside a building erected in 1973 before shutting down at the end of its 2013 season. In 2015, Heritage Square announced it was closing at the end of that year and shutting down its popular Alpine Slide ride.